"She's been ready for motherhood for a while now and to be sharing this experience with Ryan is a dream come true for her!" a source said in the OK! story.

The actors have dated since starring in "The Place Beyond the Pines" in 2011.

OK!'s source reportedly said the development has strengthened the pair's relationship. "Ryan grew up without a dad, so he always said when he had kids, he'd be there no matter what. This is it for him."

Eva Mendes in "The Place Beyond the Pines." (AP Photo/Focus Features, Atsushi Nishijima)

One would think Eva Mendes would be more than enough to hang around for, but whatever works.

Another source reportedly said no one should expect marriage between the soon-to-be parents anytime soon.

"(Gosling) doesn't think they need to marry just because they are having a baby," the source said, "but Eva believes it's important to have their lives fully intertwined."